How to Repair Outlook Data Files (.pst and .ost)

If you're searching for a way to repair Outlook data files, you're probably dealing with Outlook errors, missing emails, synchronization issues, or an Outlook profile that won't open. In most cases, these problems occur when Outlook data files become corrupted or damaged.

Before attempting advanced solutions, it's important to understand the type of Outlook data file you're working with. Outlook stores mailbox information in PST (Personal Storage Table) and OST (Offline Storage Table) files. When these files become corrupted, users often need to repair Outlook data files to restore access to their mailbox data.

Use ScanPST to Repair Outlook Data Files

Microsoft provides a built-in utility called Inbox Repair Tool (ScanPST.exe) to help users repair Outlook data files. This utility scans PST files for errors and attempts to fix basic corruption issues.

However, ScanPST has several limitations:

• Designed primarily for PST file repair
• Cannot recover severely damaged Outlook data files
• Does not support advanced OST file recovery
• May not recover deleted mailbox items
• Focuses on file structure repair rather than complete data recovery
• Can fail when corruption is extensive

For minor corruption, ScanPST may be enough to repair Outlook data files. But if the file remains inaccessible after the repair, you'll need a more advanced solution.

How to Repair Corrupted OST Files?

If your Outlook profile uses Exchange, Microsoft 365, or IMAP, Outlook creates an OST file to store mailbox data locally. When the OST file becomes damaged, users may experience Outlook crashes, synchronization errors, or missing emails.

To repair Outlook OST file format, many professionals use the SysTools OST Recovery Tool. The software can recover mailbox data from corrupted, inaccessible, orphaned, or damaged OST files.

Key Features

• Repair corrupted OST files
• Recover emails, contacts, calendars, and tasks
• Restore deleted Outlook items
• Preview recovered mailbox data
• Export recovered data into healthy formats
• Support large OST files

How to Repair Corrupted PST Files?

PST files are commonly used to store archived Outlook data and POP3 mailbox information. When a PST file becomes corrupted, Outlook may fail to open or display error messages.

If ScanPST is unable to repair Outlook PST fdata files successfully, the SysTools PST Recovery Tool can help recover mailbox data from damaged PST files.

Key Features

• Repair severely corrupted PST files
• Recover emails and attachments
• Restore contacts, calendars, notes, and journals
• Recover permanently deleted items
• Maintain original folder hierarchy
• Support large PST files

What If Both OST and PST Files Are Damaged?

In some situations, users may have corruption in both OST and PST files. This can happen due to sudden system shutdowns, malware attacks, storage issues, or Outlook crashes.

If you need to repair Outlook data files of both types, the Pro version supports recovery for both OST and PST files. This allows users to restore mailbox data from multiple Outlook data files using a single solution.

Final Thoughts

When you need to repair Outlook data files, start with Microsoft's ScanPST utility for basic corruption issues. However, if the Outlook data file is severely damaged, inaccessible, or contains important mailbox data that ScanPST cannot recover, a dedicated recovery solution may be required.

Whether you're trying to repair OST files, repair PST files, or recover data from both Outlook data file types, choosing the right recovery approach can help restore your emails, contacts, calendars, and other mailbox items with minimal data loss.